I use these units almost like a nurses call button for my wife.

Enjoy having a unit in every room esp

Every unit was flawed and could not communicate.

I tried swapping units around, changing channels, etc, but could never isolate the problem to a single defective unit; it seemed to happen to all of them.

Only three out of four units worked

I received the 2 new units and they work fine

该公司真的需要某人对他们的指示进行校对并测试产品。All that being said, the units are awesome